Numerical evaluation of external magnetic effect on electromagnetic wave transmission through reentry plasma layer

Zhao, Qing; Yang, Bo; Lei, Mingda; Liu, Shuzhang; Liu, Ying; Liu, Jianwei; Zhao, Yanzheng

doi:10.1063/1.4967758

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…D URING the atmosphere reentry of a spacecraft, the plasma or ionized gas layer surrounding the spacecraft forms a sheath [1]- [4] that intensively affects the radio frequency communication between spacecraft and ground station. Therefore, there has been significant interest in investigating the process of plasma formation and diagnostics of the plasma parameters.…”

Section: Introductionmentioning

confidence: 99%

Microwave Reflectometry to Characterize the Time-Varying Plasma Generated in the Shock Tube

et al. 2021

IEEE Access

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To investigate the behavior of plasma generated in the shock tube, microwave reflectometry is proposed to extract the permittivity r of plasma. To remove the influence of parasitic reflections caused by the surroundings, a calibration process is introduced and the unknown calibration coefficients are determined by utilizing microwave interferometry as the reference technique. The shock tube is modeled as a threelayered medium to calculate the reflection coefficient. A time-dependent reconstruction algorithm is applied and theoretically validated to eliminate the multiple solutions in the inverse problem. By comparing the permittivities extracted with microwave reflectometry and interferometry, the effects of plasma diffusion are demonstrated with a modified analytical model in the beginning time region of experiments. In addition, the nonuniform flow in the generated plasma located near the end time region is also observed. The determination of the effective time region for electron density N e and collision frequency v e extraction is discussed as well. Finally, the differences between microwave reflectometry and interferometry in terms of averaged N e < 1×10 17 m −3 and averaged v e < 1.5×10 9 s −1 are investigated in the effective time region.

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Section: Introductionmentioning

confidence: 99%

Microwave Reflectometry to Characterize the Time-Varying Plasma Generated in the Shock Tube

et al. 2021

IEEE Access

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Instantaneous polarization statistic property of EM waves incident on time-varying reentry plasma

Bai

Liu

et al. 2018

Physics of Plasmas

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An analytical method is proposed in this paper to study the effect of time-varying reentry plasma sheath on the instantaneous polarization statistic property of electromagnetic (EM) waves. Based on the disturbance property of the hypersonic fluid, the spatial-temporal model of the time-varying reentry plasma sheath is established. An analytical technique referred to as transmission line analogy is developed to calculate the instantaneous transmission coefficient of EM wave propagation in time-varying plasma. Then, the instantaneous polarization statistic theory of EM wave propagation in the time-varying plasma sheath is developed. Taking the S-band telemetry right hand circularly polarized wave as an example, effects of incident angle and plasma parameters, including the electron density and the collision frequency on the EM wave's polarization statistic property are studied systematically. Statistical results indicate that the lower the collision frequency and the larger the electron density and incident angle is, the worse the deterioration of the polarization property is. Meanwhile, in conditions of critical parameters of certain electron density, collision frequency, and incident angle, the transmitted waves have both the right and left hand polarization mode, and the polarization mode will reverse. The calculation results could provide useful information for adaptive polarization receiving of the spacecraft's reentry communication.

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Effects of Plasma Sheath on Parameter Estimations of Linear Frequency Modulation Pulse Signal

Bai

Ding

Shen

et al. 2019

IEEE Trans. Plasma Sci.

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Numerical evaluation of external magnetic effect on electromagnetic wave transmission through reentry plasma layer

Cited by 5 publications

References 17 publications

Microwave Reflectometry to Characterize the Time-Varying Plasma Generated in the Shock Tube

Microwave Reflectometry to Characterize the Time-Varying Plasma Generated in the Shock Tube

Instantaneous polarization statistic property of EM waves incident on time-varying reentry plasma

Effects of Plasma Sheath on Parameter Estimations of Linear Frequency Modulation Pulse Signal

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